48 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Table XIX.— Plots Treated with Mercury Bichloride. 



Plot. 







Infection 

 Jan. 1917. 



Infection 

 Oct. 1917. 



Substance Applied. 

 Quantity. Dilution. 



73 



X 



O 



12 cwt. 



1/500 





x 



O 



1-2 „ 



1/500 



63 



XX 



O 



3 M 



1/500 



64 



XX 



O 



3 



1/500 



25 



Tr 



O 



3 



1/500 



26 



XX 



Tr 



3 M 



1/500 



27 



XXX X 



X 



3 



1/500 



28 



XX 



O 



3 



1/500 



52 



Tr 



Tr 



3 



1/500 



In Plot 26 two small nodules were found on one plant ; in Plot 27, 

 instead of the plants being full of large brown nodules, an aggregate 

 of about two dozen pin-head nodules were found on half a dozen 

 plants. The result is very good indeed, disappointing only in the 

 nearness to a perfect result and yet just missing it. 



Table XX.— Plots Treated with Cresylic Acid. 





Infection. 



Substance Applied. 



Plot. 



Jan. 1917. 



Oct. 1917. 



Quantity 

 per acre. 



Dilution. 



62 

 476 



34 

 35 

 36 

 37 

 42 

 43 

 41 

 39 

 44 

 45 



X 



X 



X 

 XXX 



Tr 

 XX 



X 



X 



Tr 



X 



X 



Tr 



O 

 O 

 O 



XX 



X 

 Tr 



X 

 Tr 



O 



O 



O 



O 



427 gals. 

 415 „ 



\ 



M<55 „ 



385 „ 

 385 it 



1/80 

 1/80 

 1/80 

 1/80 

 1/80 

 1/80 

 1/80 

 1/80 

 1/80 

 1/80 

 1/80 

 1/80 



In this group of plots the success was by no means so marked as 

 in the two previous groups. That cresylic acid is a treatment on the 

 right lines is, however, apparent, but the quantity applied must be 

 greater to get a result. 



From Tables 21, 22, and 23 it is evident that creosote emulsion 

 did not come up to expectations, and that pyridine and Twiset did no 

 good whatever when applied in this way. 



